Hello SvenDia.
1. To access the hidden destinations :
- On Matrix, hold an Assign button and turn the Preset Encoder.
- On Macros, select an empty slot with the preset Encoder and click on it.
2. Yes the audio input is mono only, but its a lot of fun with OSC 2 filters and the FXs.
3. Sync between Osc is not available at the moment.
4. Regarding the manual, it should be available soon, sorry for the inconvenience.
Kind regards.